Hi all,does anyone have VHDL code for printing on the character LCD of the DSP Development Kit, Stratix III Edition board ? Thanks! Francesco
You can use some signaltap probes to see what is sent to the LCD controller and check if it is ok.How high is your clk frequency? If it is coming directly from the oscillator it is probably too high. You should use a counter in your process and only update your signals (including lcd_enable) only every n clock cycles. And while I'm at it, try to use ieee.numeric_std with the "unsigned" and "signed" types instead of ieee.std_logic_unsigned. It is standard and will cause less confusion when mixing unsigned and signed vectors.
file:///C:/Users/DELLCE%7E1/AppData/Local/Temp/moz-screenshot.png file:///C:/Users/DELLCE%7E1/AppData/Local/Temp/moz-screenshot-1.png i did special clk that get 25mhz and output 100khzbut also no output.can u please check the code to see whats not good file:///C:/Users/DELLCE%7E1/AppData/Local/Temp/moz-screenshot-2.png file:///C:/Users/DELLCE%7E1/AppData/Local/Temp/moz-screenshot-3.png Please help me the clock is ok but the problem in lcd code here the code of the clk library IEEE; use IEEE.STD_LOGIC_1164.all; use IEEE.STD_LOGIC_ARITH.all; use IEEE.STD_LOGIC_UNSIGNED.all; ENTITY clk_div IS PORT ( clock_25Mhz : IN STD_LOGIC; clock_1MHz : OUT STD_LOGIC; clock_100KHz : OUT STD_LOGIC; clock_10KHz : OUT STD_LOGIC; clock_1KHz : OUT STD_LOGIC; clock_100Hz : OUT STD_LOGIC; clock_10Hz : OUT STD_LOGIC; clock_1Hz : OUT STD_LOGIC); END clk_div; ARCHITECTURE a OF clk_div IS SIGNAL count_1Mhz: STD_LOGIC_VECTOR(4 DOWNTO 0); SIGNAL count_100Khz, count_10Khz, count_1Khz : STD_LOGIC_VECTOR(2 DOWNTO 0); SIGNAL count_100hz, count_10hz, count_1hz : STD_LOGIC_VECTOR(2 DOWNTO 0); SIGNAL clock_1Mhz_int, clock_100Khz_int, clock_10Khz_int, clock_1Khz_int: STD_LOGIC; SIGNAL clock_100hz_int, clock_10Hz_int, clock_1Hz_int : STD_LOGIC; BEGIN PROCESS BEGIN -- Divide by 25 WAIT UNTIL clock_25Mhz'EVENT and clock_25Mhz = '1'; IF count_1Mhz < 24 THEN count_1Mhz <= count_1Mhz + 1; ELSE count_1Mhz <= "00000"; END IF; IF count_1Mhz <= 12 THEN clock_1Mhz_int <= '0'; ELSE clock_1Mhz_int <= '1'; END IF; -- Ripple clocks are used in this code to save prescalar hardware -- Sync all clock prescalar outputs back to master clock signal clock_1Mhz <= clock_1Mhz_int; clock_100Khz <= clock_100Khz_int; clock_10Khz <= clock_10Khz_int; clock_1Khz <= clock_1Khz_int; clock_100hz <= clock_100hz_int; clock_10hz <= clock_10hz_int; clock_1hz <= clock_1hz_int; END PROCESS; -- Divide by 10 PROCESS BEGIN WAIT UNTIL clock_1Mhz_int'EVENT and clock_1Mhz_int = '1'; IF count_100Khz /= 4 THEN count_100Khz <= count_100Khz + 1; ELSE count_100khz <= "000"; clock_100Khz_int <= NOT clock_100Khz_int; END IF; END PROCESS; -- Divide by 10 PROCESS BEGIN WAIT UNTIL clock_100Khz_int'EVENT and clock_100Khz_int = '1'; IF count_10Khz /= 4 THEN count_10Khz <= count_10Khz + 1; ELSE count_10khz <= "000"; clock_10Khz_int <= NOT clock_10Khz_int; END IF; END PROCESS; -- Divide by 10 PROCESS BEGIN WAIT UNTIL clock_10Khz_int'EVENT and clock_10Khz_int = '1'; IF count_1Khz /= 4 THEN count_1Khz <= count_1Khz + 1; ELSE count_1khz <= "000"; clock_1Khz_int <= NOT clock_1Khz_int; END IF; END PROCESS; -- Divide by 10 PROCESS BEGIN WAIT UNTIL clock_1Khz_int'EVENT and clock_1Khz_int = '1'; IF count_100hz /= 4 THEN count_100hz <= count_100hz + 1; ELSE count_100hz <= "000"; clock_100hz_int <= NOT clock_100hz_int; END IF; END PROCESS; -- Divide by 10 PROCESS BEGIN WAIT UNTIL clock_100hz_int'EVENT and clock_100hz_int = '1'; IF count_10hz /= 4 THEN count_10hz <= count_10hz + 1; ELSE count_10hz <= "000"; clock_10hz_int <= NOT clock_10hz_int; END IF; END PROCESS; -- Divide by 10 PROCESS BEGIN WAIT UNTIL clock_10hz_int'EVENT and clock_10hz_int = '1'; IF count_1hz /= 4 THEN count_1hz <= count_1hz + 1; ELSE count_1hz <= "000"; clock_1hz_int <= NOT clock_1hz_int; END IF; END PROCESS; END a;
We can't see your screenshots... please either attach them to a message or use an image hosting service.The way that you generate the clock isn't really recommended for FPGAs. It is better to do everything on the 25MHz clock, using clock enables if necessary. In your code if you have glitches on the internal clock signals, the counters can count faster than expected and you won't get the frequency that you want.
Printing characters on LCD without using SOPC, Nios etc AND by using just DSP BUILDER is the main thing I'm aiming at. I've already posted a similar message on DSP Builder section but hasn't been answered yet. I'd be happy if someone solves this puzzle for us.